Question

求解答，等等好心人，要有过程的，谢谢啦，十分感谢

Answer 1

（2. 5×9.7一2.7×6.5）×1.25
原式=2.5×（9.75一6.5）×1.25
=2.5×3.2×1.25
=2.5×4×0.8×1.25
=10×1
=10.
8.2×2.4+8.2×7.6
原式=8.2×（2.4+7.6）
=8.2×10
=82.

Answer 2

（2.5×9.7-2.5×6.5）×1.25
＝2.5×（9.7-6.5）×1.25
＝2.5×3.2×1.25
＝2.5×4×0.8×1.25
＝10×1
＝10
8.2×24+82×7.6
＝82×0.1×24+82×7.6
＝82×2.4+82×7.6
＝82×（2.4+7.6）
＝82×10
＝820

Answer 3

1 2.5×(9.7-6.4)×1.25=2.5×2.5×1.25=7.8125 也可以换成分数5/2×5/2×5/4=125/16.
2. 8.2×(24+76)= 82

Answer 4

=2.5*(9.7-6.5)*1.25
=2.5*3.2*1.25
=2.5*4*0.8*1.25
=(2.5*4)*(0.8*1.25)
=10*1
=10

Answer 5